<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Calculate</title>
</head>
<body>
    <form method="POST" action="/cal">
        {% csrf_token %}
        first number <input type="number" name="valueA">
        +
        second number<input type="number" name="valueB">
        <input type="submit" name="submit">

    </form>
</body>
</html>